@article{GDZPPN002310198, title = {Nonlinear Perturbations of Uncoupled Systems of Elliptic Operators.}, journal = {Mathematische Annalen}, volume = {212}, year = {1974}, pages = {155-170}, url = {http://dml.mathdoc.fr/item/GDZPPN002310198} }
Martin, R.H. jr. Nonlinear Perturbations of Uncoupled Systems of Elliptic Operators.. Mathematische Annalen, Tome 212 (1974) pp. 155-170. http://gdmltest.u-ga.fr/item/GDZPPN002310198/